Ruiz, who has four goals in 11 outings for PSV, is keen to stay in top form at club level before representing Costa Rica at the World Cup which will precede when he learns his Cottagers fate.
"They have a new project for next season to become champions with a strong squad. I would like to be part of that.
"But first we have to see what happens. There are still games left, possibly play-offs, and after that the World Cup.
"What will happen depends on several things. I still have one year on my contract at Fulham."
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